Icom ID-31A Service Manual page 36

SECTION 11. VOLTAGE DIAGRAM
• LOGIC UNIT (1/2)
100P
C501
13 16
14 15
C35
0.01
1.78V
ON:3.29V
OFF:0V Q2
4 3 LDTC144EE
2
SN74AUP1T17DCKR
5 1
IC21
R4
C211
100k
0.1
J3
R8 47k
1 3VS
DAT2
2 SD_CS
CD/DAT3
3 SD_TXD
CMD
4
VDD
5 SD_SCK
CLK
6
VSS
7 SD_RXD
DAT0
8 SD_SENC
DAT1
9
CDA
47k R10
10
CDB
47k R11
11
47k R12
J2
47k R13
27
C8
26 1
C1
25
1
C9
24
1
C2
23 1
C10
22 1
21
C11
20 1
C3
19 1
18
C4 R280 10M
17 1
16
C5
15
1 R9 100k
14
R7 HT-191UYG HT-191UYG HT-191UYG HT-191UYG
13
12
0
11
10
9
8
7
R6
6
100k
5
4
3
2
1
MAX3221IPWR IC2
0.22 1 16
FORCEOFF
EN
2 15
C18
C1+ VCC
3 14
C19
V+ GND
4 13
0.22
C1- DOUT
C20 5 12
C2+ FORCEON
0.22 6 11
MMZ1005Y102CT C2- DIN
HSJ1621-019011
C21 7 10
INVALID
EP2 V-
J4
R14 0.22 8 9
RIN ROUT
100
MMZ1005Y102CT R21
EP3
100
EP1 C7
C22
MMZ1005Y102CT
10P 10P
F082EN7510W
COM
4
B
6
A
5
COM
1
B
3
A
2
0.42V 0.48V
S12
S8
S1
EVQPQHB55
D1
EVQPQHB55
L1SS400
S2 S5 S9
D2
EVQPQHB55 EVQPQHB55 EVQPQHB55
L1SS400
S3 S6 S10
D3
EVQPQHB55 EVQPQHB55 EVQPQHB55
L1SS400
S4 S7 S11
D4
EVQPQHB55 EVQPQHB55 EVQPQHB55
L1SS400
G_VDD
1.82V
R56
1.82V
100k
IC4
1
3.29V
INT1
2
XOUT
3
XIN
4
VSS
S-35390A
5VS
ON:3.26V
OFF:0V
TDI
DIM
LIGHT
REMOTE R50 1k
VIN R37 1k
RTONE 1k
TTEMP R43
ON:3.26V
OFF:0V DICK1
LCDDT UNLK
LCDCK DALD
LCDRS KS0
LCDRES KS2
LCDCS I0
DTMF
TCK
DAFS
LV 1k R39
1k R44
TXI-V
TEMP
R40 1k
DIUD1
CLSFT
KS1
I1
KR0
TRST
3.29V TMS
MMZ1005Y102CT
D_AS
EP5
1k
VOX R41
3VS
R42 1k
C43 CTCIN
0.1
TX232 DIUD2
DTCS
RX232
KS3
R29
KR1
100k
R30
100k
G_RES
DIUD1
DICK1
DIUD2
DICK2
L1SS400
KS3
KS2
KS1
CP1
CP2
CP3
CP4
KS0
CP5
CP6
CP7
KR2
CP8
KR1
CP9
KR0
CP10
11 - 1
Q7 DS7
3.31V
C78
YG
R72
150
0.0039
R73
330
LDTC144EE
HR
CL-165HR
LDTC144EE
8
VDD
7 TEMP
SDA
6
SCL
5
INT2
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
B1
B2
B3
B4
B5 IC5
B6
B7 R5F56106WNBG
B8
B9
B10
B11
B12
B13
B14
B15
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
L1SS400
D15 D17
R279
BAT:7.25V
0
EXT:0V
Q25
R274 2SK3019
470k
BAT:3.29V
EXT:0V
Q8 3.27V
LDTC144EE
BLED 3.29V
2SA1832
Q9
Q11
TX:3.29V
RX:0V Busy:3.29V 2.63V
Mute:0V
R84
100
N1
CLIN
M15 T3C
M14 ESIO
M13
M12 TX232
M11 TEST4
M10 DSP_REMP
M9 LCDCS
M8
LCDRS
M7
PPS
M6 DSPC
M5 DSP_STB
M4
M3
M2 CLOUT
M1
L15 R3C
L14
PS3C
L13
SPMUTE
L12 SQL
L4 CP13
3.30V
L3
CP06S
L2 PLAY RES
L1
K15 MIC2
K14 MIC1
K13
WN
K12 VCO_MUTE
K4 DSP_REQ
K3
K2
K1 NOIS
J15 PFMC
J14
J13 TXMUTE
J12
MMUTE
J4 RTC_IRQ
VIN
J3 DCIN
J2
J1 C96
H15 TEST1 0.001
H14 TEST0
H13
VCO_SEL
H12
CPU3
DCSFT
3.31V
IC7
R79
1 8
DU VCC
2 7
47k E1 WC
3 6 ECK
R80 E2 SCL
4 5 ESIO
VSS SDA
47k
M24M01
X2
CR-924
R75
1M
R76
100k
*: Refer to the PARTS LIST for the value and name of component.
3.31V
R105
1k
R101 D21
18k L1SS400
2SC4738
IC8
1 6
1A 1Y
2 5
GND VCC 12k
3 4
2A 2Y
R104
SN74LVC2GU04DCKR
Q13
VCC
BAT:7.25V
EXT:13.18V
D20
VCC
L1SS400
IC9
S-812C33AUA
I O
G
R69
10k
3.31V
IC22
1 4
VSS VDD
2 3
OUT CD
S-80929CNPF
HV
R108
68k
2SC4738
L1SS400
Q12
R103 D22 D24
10k DZ2J082M
EXT:12.93V
C100
R102
C102
47k 0.001
0.001